SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fca06634e449f226efaf9ad7369121d209f3c7660bf4999f9313d45e75a2294a' 
  AND token = 'eDkUjFBQ/MwttxA3wJwUkhLwAqSpRFiqZj3CzNDCMzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}